Monday, March 12, 2012

Mount Kerinci (3,805 m), the highest point of Sumatra

Mount Kerinci (also spelled Kerintji, among several other ways, and referred to as Gunung Kerinci, Gadang, Berapi Kurinci, Kerinchi, Korinci, or Peak of Indrapura as well) is the highest volcano in Indonesia, and the highest peak on the island of Sumatra. It is surrounded by the lush forest of Kerinci Seblat National Park, home to the endangered species of Sumatran Tiger and Sumatran Rhinoceros.


Kerinci is more active than most Indonesian volcanoes, with nearly annual phreatic eruptions. Kerinci last erupted in 2004, and continues to spew clouds of sulphurous smoke, with plumes reaching as high as 1,000 m (3,281 ft) above the summit. While there is farmland in the area, and a tea plantation on its southern slope, Kerinci, being located in an Indonesian national park, and perhaps out of respect for its frequent growlings as well, sits in an area that is sparsely populated by Indonesian population-density standards.


Kerinci can be climbed from the village of Kersik Tuo, 6 or 7 hours away from Padang by car or bus. The climb and descent normally takes 3 days and 2 nights, when choosing to go all the way to the summit. Climbers may also choose to go up only as far as Camp 2 or 2.5, skipping the summit attempt which is a night climb, taking 2 days and 1 night instead.

Kerinci's terrain consists of thick jungle, and can get muddy and slippery even if there are only mild drizzles, which may occur occasionally even during the dry season. To climb the volcano a guide is needed, as there have been rare cases of people disappearing after attempting to trek alone.


The mountain has 15 lakes which the biggest are Kerinci Lake and Gunung Tujuh Lake. The 4,200-hectare of Kerinci Lake lies at a height of 650 meters, is the host of annual July Kerinci Lake Festival. While Gunung Tujuh Lake means Seven Mountains Lake which there are 7 peaks surrounding the lake. It is also the highest lake in Southeast Asia at 1,996 meters.

Kecik Wok Gedang Wok

Based on research in 1973, 'Kecik Wok Gedang Wok' people is recognized as the first tribe to settle at a plateau around Mount Kerinci 10,000 years ago. It was older than Indian Inca civilization. Today, Kecik Wong Gedang Wok people is so limited due to many of them has assimilated with Proto-Malay tribe which come later. There are around of 135 dialects uses only along the valley makes ethnography analysis is difficult to conduct.

Saturday, March 3, 2012

Gunung Rinjani (3,726 m), an active volcano on the island of Lombok

Mount Rinjani or Gunung Rinjani is an active volcano in Indonesia on the island of Lombok. Administratively the mountain is in the Regency of North Lombok, West Nusa Tenggara (Indonesian: Nusa Tenggara Barat, NTB). It rises to 3,726 metres (12,224 ft), making it the second highest volcano in Indonesia.

On the top of the volcano is a 6 km by 8.5 km caldera, which is filled partially by the crater lake known as Segara Anak (Child of the Sea). This lake is approximately 2000 metres above sea level and estimated at being around 200 metres deep; the caldera also contains hot springs.


Lombok is one of the Lesser Sunda Islands, a small archipelago which, from west to east, consists of Bali, Lombok, Sumbawa, Flores, Sumba and the Timor islands; all are located at the edge of the Australian continental shelf. Volcanoes in the area are formed due to the action of oceanic crusts and the movement of the shelf itself. Rinjani is one of at least 129 active volcanoes in Indonesia, four of which belong to the volcanoes of the Sunda Arc trench system forming part of the Pacific Ring of Fire – a section of fault lines stretching from the Western Hemisphere through Japan and South East Asia. The islands of Lombok and Sumbawa lie in the central portion of the Sunda Arc. The Sunda Arc is home to some of the world's most dangerous and explosive volcanoes. The eruption of nearby Mount Tambora on Sumbawa is known for the most violent eruption in recorded history on 15 April 1815, with a scale 7 on the VEI.

The highlands are forest clad and mostly undeveloped. The lowlands are highly cultivated. Rice, soybeans, coffee, tobacco, cotton, cinnamon, cacao, cloves, cassava, corn, coconuts, copra, bananas and vanilla are the major crops grown in the fertile soils of the island. The slopes are populated by the indigenous Sasak population. There are also some basic tourist related activities established on Rinjani primarily in or about the village of Senaru.

Rinjani volcano on the island of Lombok rises to 3,726 metres (12,224 ft), second in height among Indonesian volcanoes only to Sumatra's Kerinci volcano. Rinjani has a steep-sided conical profile when viewed from the east, but the western side of the compound volcano is truncated by the 6 x 8.5 km, oval-shaped Segara Anak caldera. The western half of the caldera contains a 230 metre-deep lake whose crescentic form results from growth of the post-caldera cone Barujari at the eastern end of the caldera.

Geologic summary

On the basis of Plate Tectonics Theory, Rinjani is one of the series of volcanoes built in the Lesser Sunda Islands due to the subduction of Indo-Australian oceanic crust beneath the Lesser Sunda Islands, and it is interpreted that the sources of melted magma is at about 165–200 km depth.

The geology and tectonic setting of Lombok (and nearby Sumbawa) are described as being in the central portion of the Sunda Arc. The oldest exposed rocks are Miocene, suggesting that subduction and volcanism began considerably later than in Java and Sumatra to the west, where there are abundant volcanic and intrusive rocks of Late Mesozoic age. The islands are located on the eastern edge of the Sunda shelf, in a zone where crustal thickness is apparently rapidly diminishing, from west to east.

The seismic velocity structure of the crust in this region is transitional between typical oceanic and continental profiles and the Mohorovičić discontinuity (Moho) appears to lie at about 20 km. These factors tend to suggest that there has been limited opportunity for crustal contamination of magmas erupted on the islands of Lombok and Sumbawa. In addition, these islands lie to the west of those parts of the eastern-most Sunda and west Banda arcs where collision with the Australian plate is apparently progressing.

The volcano of Rinjani is be located between 165 and 190 km above the Benioff Zone. There is a marked offset in the line of active volcanoes between the most easterly Sumbawa Volcano (Sangeang Api) and the line of active volcano in the Flores. This suggests that a major transcurrent fault cut across the arc between Sumbawa Island and Flores. This is considered to be a feature representing a major tectonic discontinuity between the east and west Sunda Arcs (the Sumba Fracture). Further. A marked absence of shallow and intermediate earthquake activity in the region to the south of Lombok and Sumbawa is a feature interpreted to represent a marked break in the Sunda Arc Zone. Faulting and folding caused strong deformation in the eastern part of Lombok Basin and is characterized by block faulting, shale diapirs and mud volcano.


The Rinjani caldera forming eruption is thought to have occurred in the 13th century. Eruption rate, eruption sites, eruptiion type and magma composition have changed during the last 10,000 years before the caldera forming eruption. The eruptions of 1994 and 1995 have presented at Gunung Baru (or 'New Mountain' - approximately 2300 metre above sea level) in the center of this caldera and lava flows from subsequent eruptions have entered the lake. This cone has since been renamed Gunung Barujari (or 'Gunung Baru Jari' in Indonesian).

The first historical eruption occurred in September 1847. The most recent eruption of Mount Rinjani was in May 2010 and the most recent significant eruptions occurred during a spate of activity from 1994 to 1995 which resulted in the further development of Gunung Barujari. Historical eruptions at Rinjani dating back to 1847 have been restricted to Barujari cone and the Rombongan dome (in 1944) and consist of moderate explosive activity and occasional lava flows that have entered Segara Anak lake. The eruptive history of Rinjani prior to 1847 is not available as the island of Lombok is in a location that remained very remote to the record keeping of the era.

On 3 November 1994, a cold lahar (volcanic mudflow) from the summit area of Rinjani volcano traveled down the Kokok Jenggak River killing thirty people from the village of Aikmel who were caught by surprise when collecting water from the river in the path of the flow.

In connection with the eruption of the cone Gunung Barujari the status for Gunung Rinjani has been raised from Normal (VEI Level 1) to 'be vigilant' (VEI Level 2) since May 2, 2009 . In May 2010 Gunung Rinjani was placed in the standby status by Center for Volcanology & Geological Hazard Mitigation, Indonesia with a recommendation that there be no activity within a radius of 4 km from the eruption at Gunung Barujari.

Volcanic composition

In Lombok, Rinjani volcano lies approximately 300 km north of the Sunda Trench (also known as Java trench) and is situated about 170 km above the active north dipping Benioff zone. Based on the composition of andesites which have very low Ni concentrations and low Mg/Mg+Fe It is suggested that the Rinjani suite is of mantle origin, but that all the andesites and dacites as well as many of the basalts have probably been modified by fractional crystallization processes. It is concluded that the Rinjani calc-alkaline suite, which in many respects is typical of many suites erupted by circum-pacific volcanoes, probably originated by partial melting of the peridotite mantle-wedge overlying the active Benioff Zone beneath Lombok Island. The Pleistocene-Recent calcalkaline suite from the active volcano, Rinjani is composed of a diverse range of lavas. These include: ankaramite, high-Al basalt, andesite, high-K andesite and dacite. Sr-isotopic and geochemical constraints suggest that this suite was derived from the sub-arc mantle. Geochemical models suggest that fractional crystallization is an important process in the suite's differentiation, although the series: ankaramite-high-Al basalt-andesite-dacite does not represent a continuously evolving spectrum of liquids.

Recent activity

Rinjani erupted three times on May 22, 2010 with activity continuing until early on May 23. According to the volcano's official monitoring agency, ash from Mount Barujari was reported as rising up to two km into the atmosphere and damaged crops. The volcano did not threaten villagers at that time. Lava flowed into the caldera lake, pushing its temperature up from 21°C to 35°C, while smoke spread 12 km.
In February 2010 observers at the Gunung Rinjani Observation Post located 12.5 km (4000 feet) NE northeast of G. Rinjani saw one whitish-colored plume that rose 100 metres (328 ft) from the volcano. Dense whitish plumes (and possibly brown) rose 500 metres (1,640 ft) - 900 metres (2,953 ft) in March 2010 on 26 occasions and as high as 1,500 metres (4,921 ft) in April 2010 on 41 occasions. Plumes seen on 1 and 2 May 2010 were "chocolate" in color and rose a maximum height of 1,600 metres (5,249 ft). From February 2010 through April 2010 seismicity decreased, although the maximum amplitude of earthquakes increased. CVGHM (Center of Volcanology and Geological Hazard Mitigation) also noted that ash eruptions and ejected incandescent material fell within Rinjani caldera, but some ash was blown out of the caldera.

The activity in early 2010 centred about Gunung Barujari a post-caldera cone that lies within the Rinjani's caldera lake of Segara Anak. The Volcanological Survey of Indonesia reported on 1 May 2010, that a column of smoke was observed rising from G. Rinjani "issuing eruptions 1300-1600 metres tall with thick brown color and strong pressure". Their report Evaluasi Kegiatan G. Rinjani of 4 May also stated that on 1 May 2010 at 10:00 four events of Explosve Earthquake were recorded with a maximum amplitude of 6–53 mm and 110 seconds long earthquake, earthquake tremor events with a maximum amplitude of 1 mm and 55 second long duration, 15 Local Tectonic earthquake events and two events of tectonic earthquake.

The Volcanic Explosivity Index (VEI) Alert Level was raised to 2 (on a scale of 1-4) on 2 May 2010. Level 1 is "Normal" and Level 2 is "Advisory" with an Aviation Alert color of Yellow-Advisory. Based on analysis of satellite imagery, the Darwin VAAC (Volcanic Ash Advisory Center) reported that on 5 May a possible ash plume from Rinjani rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted 150 km NW. The plume was not seen in imagery about six hours later. CVGHM (Center of Volcanology and Geological Hazard Mitigation) advised the VAAC that intermittent activity could produce ash plumes to 1.5 km (5,000 ft) above the caldera.

On 27 April 2009 Gunung Barujari became active with activity continuing through to May 2009. The mountain was closed at that time as the eruptions intensified with plumes of smoke and ash as high as 8,000 m (26,250 ft). A Volcanic Explosivity Index (VEI):2 rating was issued for the activity between 2 May 2009 and 20 December 2009. The activity during this period was described as having the characteristics:of central vent eruption, flank (excentric) vent, explosive eruption and lava flow.

Previous activity

On 27 September 2004 a DVGHM (Directorate of Volcanology and Geological Hazard Mitigation) report noted the decision to increase Rinjani's hazard status to Volcanic Explosivity Index (VEI) Alert Level 2 (Yellow). During the last third of 2004, the number of volcanic and tectonic earthquakes had increased. Their increase followed a rise in the number of tectonic earthquakes that began 18 August 2004. Tremor registered on 23, 24, 25, and 26 September 2004. Tremor amplitudes ranged between 12 and 13.5 mm, and the duration of the tremor stood between 94 and 290 seconds.

In September 1995 an aviation report was issued concerning an unconfirmed ash cloud from Rinjani. A NOTAM about volcanic activity from Rinjani was issued by the Bali Flight Information Region on the morning of 12 September. An ash cloud was reportedly drifting to the south west with the cloud top around 4 km altitude.

On 3 November 1994, a cold lahar (volcanic mudflow) from the summit area of Rinjani volcano traveled down the Kokok Jenggak River killing thirty people from the village of Aikmel who were caught by surprise when collecting water from the river in the path of the flow. One person remained missing as of 9 November 1994. No damage to the village was reported. Local volcanologists noted that additional lahars could be triggered by heavy rainfall.

During 4 June 1994-January 1995 the DVGHM (Directorate of Volcanology and Geological Hazard Mitigation) noted that explosions occurred on Rinjani. Those explosions came from the Barujari volcano. At 0530 on 1 October 2004 Rinjani erupted. The eruption caused authorities to immediately raise the hazard status to Alert Level 3 (Orange). Details regarding the initial 1 October 2004 eruption are indistinct. During 2–5 October 2004 explosions sent ash columns ~300 to 800 metres above the summit. Gray, thick ash columns drifted to the north and detonation sounds accompanied every explosion. Successive explosions occurred at intervals of 5 to 160 minutes. Explosions vented on the north eastern slope of Barujari volcano. Some material also vented from Barujari's peak and fell down around its edifice. A press report in the Jakarta Post indicated that evacuations were not considered necessary. A Volcanic Explosivity Index (VEI):2 rating was issued for the activity between 1 May 2004 through to (on or after) 5 October 2004.

Between 3 June 1994 and 21 November 1994 records of Rinjani's eruptive history indicate activity accorded Volcanic Explosivity Index (VEI) with a rating of 3 with the area of activity described as Gunung Barujari. Eruptive characteristics documented for the events of that time are described as, central vent eruption with an explosive eruption, with pyroclastic flow(s), lava flow(s), fatalities and mudflow(s) (lahars).

In May 1994 a glow was noticed on the crater floor of Barujari cone, which at this time had undergone no significant activity since August 1966. A portable seismograph (PS-2) and telemetry seismograph (Teledyne) were put into operation on 27 May and 9 June, respectively. One volcanic earthquake event/day was recorded on 27, 28, 30, and 31 May. After 4 June, however, volcanic tremor with a maximum amplitude of 35 mm was recorded, presumably associated with the upward movement of magma. At 0200 on 3 June1994, Barujari cone began erupting by sending an ash plume 500 m high. One 8 June 1994 press report described emission of "smoldering lava" and "thick smoke," as well as ashfall in nearby villages from an ash cloud rising 1,500 m above the summit. Between 3 and 10 June 1994, up to 172 explosions could be heard each day from the Sembalun Lawang volcano observatory (~15 km NE). During this period, seismic data indicated a dramatic increase in the number of explosions per day, from 68 to 18,720. Eruptions were continuous at least through 19 June 1994, with maximum ash plume heights of 2,000 m on 9–11 June 1994.

Between 28 March 1966 and 8 August 1966 records of Rinjani's eruptive history indicate activity accorded a Volcanic Explosivity Index (VEI) rating of 1. Lava volume of 6.6 x 106 m3 and a tephra volume of 2 x 104 m3 was recorded. The area of activity described was the east side of Barujari (2250 m). Eruptive characteristics were documented as a central vent eruption, explosive eruption and lava flow(s).[42]

In December 1944 Rinjani appears to have had a significant event. Between December 25, 1944 and 1 January 1945 eruptive activity is rated 2 on the Volcanic Explosivity Index (VEI) The event has been listed in the historical records of the Global Volcanism Program indicating a lava volume: of 7.4 x 107 m3 occurring in an area of activity on the north west flank of Barujari (Rombongan). The eruptive characteristics are described a central vent eruption on the flank (excentric) vent, a crater lake eruption, explosive eruption, lava flow(s) and a lava dome extrusion with associated damage to land, property.

Monitoring program

Gunung Rinjani Observation Post Rinjani Sembalun is located in the village of Lawang, Sub Sembalun 12.5 km (4000 feet) northeast of G. Rinjani) in the Regency of East Lombok. Observers at this post monitor G.Rinjani, G.Barujari/G.Tenga within the Segara Anak Caldera.

Rinjani National Park

The volcano and the caldera are protected by the Gunung Rinjani National Park established in 1997. Tourism is increasingly popular with trekkers able to visit the rim, make their way into the caldera or even to make the more arduous climb to the highest point; fatalities, however, are not uncommon. In July 2009 the summit route was closed due to volcanic activity at that time and subsequently reopened when the activity decreased. During early 2010 up to and including May 2010 access to Rinjani was at times again restricted due to volcanic activity.

The park is popular for mountain climbs and trekking and represents an important nature reserve and water catchement area. The park is officially 41,330 hectares within the park boundaries and includes a further 66,000 hectares of protected forest outside. The mountain and its satellites form the Mount Rinjani National Park (Taman Nasional Gunung Rinjani) - officially 41,000 hectares within the park boundaries and a further 66,000 hectares of protected forest outside. In 2008, the Indonesian government proposed to UNESCO that Mount Rinjani be one of the world's official geoparks. If this was approved by UNESCO, Mount Rinjani would become the first such geological park in Indonesia.

It has been claimed that the preliminary documentation required for UNESCO registration has not received sufficient support from the Nusa Teggara Barat government offices. Among the requirements to become a geo-park sufficient information must be supplied to show that the location has sufficient and appropriate management, information services, access to educational instruction to facilitate "knowledge-based geotourism", the implementation of a sustainable regional economy, biodiversity conservation, and to have established public access to the park area.

Mount Rinjani has obtained the World Legacy Award from Conservation International and Traveller (2004), and was a finalist for Tourism for Tomorrow Awards (2005 dan 2008) from the World Travel Tourism Council (WTTC).

Eruption history of Rinjani

VEI Date Start-Stop Lava Volume Tephra Volume Area of Activity Eruptive Characteristics Note
2 2010 February
2010 May 23

Gunung Barujari Smoke Plumes ash eruptions ejected incandescent material
fell within Rinjani caldera

some ash was blown out of the caldera
possible ash plume rose to an altitude of 5.5 km
further ash plumes to 2km, lava flows, crop damage
SI / USGS Weekly Volcanic Activity Report-Rinjani
PVMGV-Evaluasi Kegiatan G. Rinjani ABC Asia Pacific News Service 24 may2010
2 2009 May 2
2009 Dec 20 (?)

NE flank of Gunung Barujari Central vent eruption Flank (excentric) vent Explosive eruption Lava flow(s) Historical Records
2 2004 Oct 1
2004 Oct 5
(on or after)

Summit and NE flank of Gunung Barujari Central vent eruption Central vent eruption Flank (excentric) vent Explosive eruption Historical Records
0 1995 Sep 12

Explosive eruption (?) Historical Records
Eruption "Uncertain"
3? 1994 Jun 3
1994 Nov 2

Gunung Barujar Central vent eruption Explosive eruption Pyroclastic flow(s) Lava flow(s) Fatalities Mudflow(s) (lahars) Historical Records
(VEI): 3
1 1966 Mar 28
1966 Aug 8
6.6 x 10⁶ m³ 2 x 10⁴ m³ Eastern side of Gunung Barujari (2250 m) Central vent eruption Explosive eruption Lava flow(s) Historical Records
0? 1965 Sep
(end) Unknown

Gunung Barujari Flank (excentric) vent eruption
Lava flow(s)
Historical Records
0? 1953 Oct 15
± 45 days
(end) Unknown

Gunung Barujari Central vent eruption Historical Records
(VEI): 0?
0? 1949
1950 (months uncertain)

NW flank of Gunung Barujari Central vent eruption Explosive eruption Lava flow(s) Historical Records
2 1944 Dec 25
1945 Jan 1 (?)
7.4 x 10⁷ m³
NW flank of Barujari (Rombongan) Central vent eruption Flank (excentric) vent Crater lake eruption Explosive eruption Lava flow(s) Lava dome extrusion Damage (land, property, etc.) Historical Records
0 1941 May 30
(end) Unknown

Rinjani summit Central vent eruption Historical Records
Eruption is Uncertain
2 1915 Nov 4
(end) Unknown

Gunung Barujari
(Segara Munjar)
Central vent eruption Explosive eruption Historical Records
2 1909 Nov 30
1909 Dec 2

Gunung Barujari Central vent eruption Explosive eruption
Mudflow(s) (lahars)
Historical Records
1 1906 Apr 29
(end) Unknown

Gunung Barujari Central vent eruption Explosive eruption Historical Records
2 1901 Jun 1
1901 Jun 2

Gunung Barujari Central vent eruption Explosive eruption Historical Records
2 1900 Nov 30
1900 Dec 2

Gunung Barujari Central vent eruption Explosive eruption Lava flow(s) Historical Records
2 1884 Aug 8
1884 Aug 10
± 1 day

Gunung Barujari Central vent eruption Explosive eruption Historical Records
2 1847 Sep 10
1847 Sep 12

Gunung Barujari Central vent eruption Explosive eruption Historical Records
n/a 13th century (?)
exact date unknown

Gunung Rinjani Possible caldera forming eruption Speculative date
Refer to scientific literature

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